Boost converter and method for its operation
a boost converter and operation method technology, applied in the field of boost converters, can solve problems such as the beginning of the oscillation of the boost converter, and achieve the effects of safe operation of subsequent circuit components, and safe operation of the boost converter
Active Publication Date: 2013-09-12
ROBERT BOSCH GMBH
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Benefits of technology
The present invention provides a method for safely operating a boost converter by establishing two voltage thresholds. The first threshold is set below the usual setpoint output voltage of the boost converter to avoid soaring, while the second threshold is set below the input voltage to deactivate the boost converter for safe operation. The first threshold is adjusted based on the first setpoint output voltage to ensure a smooth transition to the second setpoint output voltage. The technical effect of this invention is to improve the stability and safety of the boost converter during operation.
Problems solved by technology
If the input voltage of the boost converter, in this instance, is close to the desired output voltage, the boost converter begins to oscillate, since one is not able to set transformation ratios that are as small as desired.
Method used
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Embodiment Construction
[0013]FIG. 1 shows a curve over time of input voltage U_E and setpoint output voltage U_A_setpoint of a boost converter operated using the method, according to the present invention, but not shown. In a first time range from T0 to T1, the input voltage rises continually, but is always below a first voltage threshold value U_lim1, which is established to be below a first voltage U_A1. In this time range (T0-T1), first voltage U_A1, that is independent of the input voltage, is preset in the boost converter as the setpoint output voltage U_A_setpoint. In this context, first voltage U_A1 specifies an increased voltage level compared to input voltage U_E, which is required for the safe functional capacity of subsequent circuit components. First voltage U_A1 is shown in FIG. 1 as a constant voltage, but may also be variable over time. It is meaningful, at least in this case, to establish first voltage threshold value U_lim1 as a function of first voltage U_A1, to avoid the soaring of the ...
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In a boost converter operation, a first voltage that is independent of an input voltage of the boost converter is preset in the boost converter, having an increased voltage level compared to the input voltage, as the setpoint output voltage, as long as the input voltage is below a first voltage threshold value, which is lower than the first voltage. As soon as the input voltage exceeds the first voltage threshold value, a second voltage that is a function of the input voltage is preset, having a lower voltage level compared to the input voltage, as the setpoint output voltage. As soon as the input voltage drops below a second voltage threshold value, which is lower than the first voltage, the first voltage is again preset as the setpoint output voltage.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a boost converter and a method for its operation.[0003]2. Description of the Related Art[0004]Boost converters, designated frequently also as step-up converters, represent a special form of a DC converter, and are used to convert an input voltage to an output voltage having an increased voltage potential. Step-up converters have been known for a long time and are used in manifold fields of use, such as in a hybrid or electric vehicle, for converting a low voltage direct voltage (on-board voltage) to a high voltage direct voltage. If the input voltage of the boost converter, in this instance, is close to the desired output voltage, the boost converter begins to oscillate, since one is not able to set transformation ratios that are as small as desired. In order to assure the safety and availability of the boost converter, it is necessary to avoid such a rapid soaring of the boost converter...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G05F1/46
CPCH02M3/156G05F1/46H02M2001/0022H02M1/0022H02M1/0003
Inventor KNORPP, THOMASRUFFER, MICHAELBINHACK, STEPHANMOLLENKOPF, WOLFGANG
Owner ROBERT BOSCH GMBH